A Review on the Origin of Synthetic Metal Radical:Singlet Open-Shell Radical Ground State?
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- 英文论文题名：A Review on the Origin of Synthetic Metal Radical:Singlet Open-Shell Radical Ground State?
- 论文作者：Yuan Li
- 英文论文作者：Yuan Li ; School of Chemistry and Chemical Engineering ; South China University of Technology
- 年：2017
- 作者机构：School of Chemistry and Chemical Engineering, South China University of Technology;
- 英文论文关键词：radical ; quinoid ; donor-acceptor-donor small molecules ; conjugated polymers
- 会议召开时间：2017-05-27
- 会议录名称：第四届新型太阳能电池学术研讨会论文集
- 英文会议录名称：Abstract Book of the 4th Conference on New Generation Solar Cells
- 语种：英文
- 分类号：TN304.5
- 学会代码：ZKYQ
- 会议名称：第四届新型太阳能电池学术研讨会
- 会议地点：中国北京
- 主办单位：中国可再生能源学会光化学专业委员会
- 学会名称：中国科学院物理研究所清洁能源实验室
- 页数：1
- 文件大小：527k
- 原文格式：D
- 会议级别：全国
摘要
In synthetic metals, free radicals in neutral organic semiconductors are acknowledged as their defects or impurities.However, polycyclic aromatic hydrocarbons(PAHs) with singlet open-shell diradical ground state encourage us to investigate the other potential origin of radicals in neutral organic semiconductors.Herein, for the first time, we observed strong electron spin resonance(ESR) signal in a serials of typical small molecule(SMs).Neutral SMs(NSMs) with strong acceptors including benzothiadiazole, diketopyrrolopyrrole, and naphthalene diimide showed significant ESR signals while they contained strong donors.From the unexpected ~1H NMR broadening and increase of ESR signal, we propose TPA-DPP has singlet open-shell ground state and thermally populated triplet species excited via rising temperature, which represent our new viewpoints different from previous reports.The intensity of the ESR signals and singlet-triplet energy gap of the NSMs are related to their electronic delocalization effect and energy band gap.Moreover, significant ESR spectra were also detected in neutral conjugated polymers, e.g., PCDTBT, P3HT, PTB7, and PffBT4T-2OD.We speculate the open-shell quinoid-radical resonance structure may acts as one of the potential origin of the universal ESR signals of semiconductors.This study provides a novel perspective to understand the structure-radical-property relationship of semiconductors.
In synthetic metals, free radicals in neutral organic semiconductors are acknowledged as their defects or impurities.However, polycyclic aromatic hydrocarbons(PAHs) with singlet open-shell diradical ground state encourage us to investigate the other potential origin of radicals in neutral organic semiconductors.Herein, for the first time, we observed strong electron spin resonance(ESR) signal in a serials of typical small molecule(SMs).Neutral SMs(NSMs) with strong acceptors including benzothiadiazole, diketopyrrolopyrrole, and naphthalene diimide showed significant ESR signals while they contained strong donors.From the unexpected ~1H NMR broadening and increase of ESR signal, we propose TPA-DPP has singlet open-shell ground state and thermally populated triplet species excited via rising temperature, which represent our new viewpoints different from previous reports.The intensity of the ESR signals and singlet-triplet energy gap of the NSMs are related to their electronic delocalization effect and energy band gap.Moreover, significant ESR spectra were also detected in neutral conjugated polymers, e.g., PCDTBT, P3HT, PTB7, and PffBT4T-2OD.We speculate the open-shell quinoid-radical resonance structure may acts as one of the potential origin of the universal ESR signals of semiconductors.This study provides a novel perspective to understand the structure-radical-property relationship of semiconductors.
In synthetic metals, free radicals in neutral organic semiconductors are acknowledged as their defects or impurities.However, polycyclic aromatic hydrocarbons(PAHs) with singlet open-shell diradical ground state encourage us to investigate the other potential origin of radicals in neutral organic semiconductors.Herein, for the first time, we observed strong electron spin resonance(ESR) signal in a serials of typical small molecule(SMs).Neutral SMs(NSMs) with strong acceptors including benzothiadiazole, diketopyrrolopyrrole, and naphthalene diimide showed significant ESR signals while they contained strong donors.From the unexpected ~1H NMR broadening and increase of ESR signal, we propose TPA-DPP has singlet open-shell ground state and thermally populated triplet species excited via rising temperature, which represent our new viewpoints different from previous reports.The intensity of the ESR signals and singlet-triplet energy gap of the NSMs are related to their electronic delocalization effect and energy band gap.Moreover, significant ESR spectra were also detected in neutral conjugated polymers, e.g., PCDTBT, P3HT, PTB7, and PffBT4T-2OD.We speculate the open-shell quinoid-radical resonance structure may acts as one of the potential origin of the universal ESR signals of semiconductors.This study provides a novel perspective to understand the structure-radical-property relationship of semiconductors.
引文
[1]Y.D.Li,L.Li,Y.Wu,Y.Li,The Journal of Physical Chemistry C,2017,121,8579.
[2]Y.Y.Xue,P.P.Guo,H.-L.Yip,Y.Li,Y.Cao,Jourmal of Materials Chemistry A,2017,5,3780.
[3]Y.Y.Xue,Y.Wu,Y.Li,Journal of Power Sources,2017,344,160.
[4]Y.D.Li.M.Y.Liu,Y.Li,Y.Kai,L.J.Xu,W.Yu,R.F.Chen,X.Q.Xue,H.-L.Yip,Advanced Energy Materials,2017,7,1601499.
[2]Y.Y.Xue,P.P.Guo,H.-L.Yip,Y.Li,Y.Cao,Jourmal of Materials Chemistry A,2017,5,3780.
[3]Y.Y.Xue,Y.Wu,Y.Li,Journal of Power Sources,2017,344,160.
[4]Y.D.Li.M.Y.Liu,Y.Li,Y.Kai,L.J.Xu,W.Yu,R.F.Chen,X.Q.Xue,H.-L.Yip,Advanced Energy Materials,2017,7,1601499.